A structure of a single-gear reduction box assembly cooled by an intermediate shaft ring gear

Abstract

The present application relates to a kind of structures of single-grade reduction gearbox assembly cooled by intermediate shaft gear ring, input shaft, intermediate shaft and output shaft are contained by left shell and right shell, wherein input shaft gear ring is engaged with intermediate shaft big gear ring and intermediate shaft small gear ring is engaged with differential gear ring transmission.Especially, intermediate shaft is designed uniquely, intermediate shaft small gear ring is processed on outer circumferential surface, intermediate shaft big gear ring is firmly connected to its outer circumferential surface, and hollow oil channel and multiple regularly arranged intermediate shaft spray holes are provided.These channels cleverly guide lubricating oil to key positions such as bearings and gear rings by arranging reasonable included angle and communication mode to achieve active lubrication and cooling effect.In addition, left and right shell oil-collecting and oil-guiding grooves and corresponding bearing mounting grooves are designed to make oil flow effectively.Overall, the present application combines the advantages of active and passive lubrication through the clever design of intermediate shaft, aiming to improve the performance of electric drive reduction gearbox while reducing costs.

Description

Technical Field

[0001] This invention relates to the field of cooling technology for single-speed gearbox assemblies, and particularly to a structure for cooling a single-speed gearbox assembly using an intermediate shaft gear ring. Background Technology

[0002] The lubrication systems for single-speed gearboxes in new energy vehicles typically employ two forms: active lubrication and passive lubrication. In active lubrication systems, a mechanical or electronic pump applies pressure to deliver lubricating oil through designed oil passages to the bearings or gear rings. However, active lubrication systems have some drawbacks, such as requiring the design of complex oil passage networks, and the selection of appropriate oil pumps usually incurs significant costs.

[0003] In contrast, passive lubrication systems utilize the churning action between the gear rings to lubricate and cool the surfaces of the housing. While passive lubrication systems typically require more housing features, such as oil guides and oil collection boxes, these are designed to ensure that splashed oil flows smoothly to the desired locations. However, a drawback of passive lubrication systems is that relatively less lubricating oil splashes onto areas such as bearings, resulting in less overall lubrication and cooling performance compared to active lubrication systems.

[0004] Therefore, there is an urgent need to develop a structure that utilizes the intermediate shaft gear ring to cool the single-speed gearbox assembly in order to solve the problems of complex and costly active lubrication systems, while improving the lubrication and cooling effects of passive lubrication systems. Summary of the Invention

[0005] This application provides a structure for cooling a single-speed gearbox assembly using an intermediate shaft gear ring. It innovatively combines the advantages of active and passive lubrication in the gearbox lubrication system. Through the ingenious design of the intermediate shaft, it achieves multiple technical effects, providing strong support for improving the performance and controlling the cost of electric drive gearboxes.

[0006] This invention discloses a structure for cooling a single-speed gearbox assembly using an intermediate shaft gear ring. The assembly includes a left housing and a right housing. An input shaft, an intermediate shaft, and an output shaft are disposed within the left and right housings. The input shaft is equipped with a bearing and an input shaft gear ring. The intermediate shaft is equipped with a bearing, an intermediate shaft small gear ring, and an intermediate shaft large gear ring. The output shaft is equipped with a bearing and a differential large gear ring. The input shaft gear ring and the intermediate shaft large gear ring mesh with each other, as do the intermediate shaft small gear ring and the differential large gear ring. A left housing is disposed on the left housing. The intermediate shaft includes an oil collecting and guiding groove and multiple left housing bearing mounting slots, each of which is connected to the left housing oil collecting and guiding groove. The right housing also has a right housing oil collecting and guiding groove and multiple right housing bearing mounting slots, each connected to the right housing oil collecting and guiding groove. A small gear ring is machined onto the outer circumferential surface of the intermediate shaft, and a large gear ring is fixedly attached to the outer circumferential surface of the intermediate shaft. A hollow oil passage is coaxially arranged within the intermediate shaft. The outer circumferential wall of the intermediate shaft is provided with intermediate oil passages spaced circumferentially and extending radially. Intermediate shaft spray holes are provided, which are connected to the hollow oil passage. The intermediate shaft has small gear rings with oil spray holes spaced circumferentially on its intermediate shaft. The angle between the central axis of each small gear ring oil spray hole and the central axis of the intermediate shaft spray hole is acute. Each small gear ring oil spray hole is connected to the hollow oil passage. The outer peripheral wall of the intermediate shaft also has first large gear ring oil spray holes spaced circumferentially and extending radially. The large gear ring has second large gear ring oil spray holes spaced circumferentially on its outer peripheral wall. The second intermediate shaft large gear ring has two oil injection holes, which are arranged in a one-to-one correspondence with the first intermediate shaft large gear ring oil injection holes. Each second intermediate shaft large gear ring oil injection hole includes a straight oil injection hole arranged coaxially with the first intermediate shaft large gear ring oil injection hole and an oblique oil injection hole arranged at an obtuse angle to the straight oil injection hole. The central axis of the oblique oil injection hole is arranged out of plane with the intermediate shaft small gear ring oil injection hole. The central axis of the intermediate shaft small gear ring oil injection hole intersects the oil collection and guide groove of the left housing, and the central axis of the oblique oil injection hole intersects the oil collection and guide groove of the right housing.

[0007] In a preferred embodiment of the present invention, the input shaft is provided with bearing A, an input shaft gear ring and bearing B, and the input shaft gear ring is located between bearing A and bearing B.

[0008] In a preferred embodiment of the present invention, the intermediate shaft is provided with a C bearing, a small intermediate shaft gear ring, a large intermediate shaft gear ring, and a D bearing, wherein the small intermediate shaft gear ring and the large intermediate shaft gear ring are located between the C bearing and the D bearing.

[0009] In a preferred embodiment of the present invention, the output shaft is provided with an E bearing, a differential large gear ring and an F bearing, wherein the differential large gear ring is located between the E bearing and the F bearing.

[0010] In a preferred embodiment of the present invention, the left housing is provided with a left housing oil collecting and guiding groove, a left housing B bearing mounting groove, a left housing D bearing mounting groove and a left housing F bearing mounting groove, and the left housing B bearing mounting groove, the left housing D bearing mounting groove and the left housing F bearing mounting groove are respectively connected to the left housing oil collecting and guiding groove.

[0011] In a preferred embodiment of the present invention, the right housing is provided with a right housing oil collecting and guiding groove, a right housing A bearing mounting groove, a right housing C bearing mounting groove and a right housing E bearing mounting groove, and the right housing A bearing mounting groove, the right housing C bearing mounting groove and the right housing E bearing mounting groove are respectively connected to the right housing oil collecting and guiding groove.

[0012] In a preferred embodiment of the present invention, the inner sidewall of the left housing is provided with oil guide ribs and intermediate oil guide holes for guiding the lubricating oil in the oil collection and guide groove of the left housing to the bearing mounting groove of the left housing B, the bearing mounting groove of the left housing D, and the bearing mounting groove of the left housing F, respectively.

[0013] In a preferred embodiment of the present invention, the inner sidewall of the right housing is provided with oil guide ribs and intermediate oil guide holes for guiding the lubricating oil in the right housing oil collection and guide groove to the right housing A bearing mounting groove, the right housing C bearing mounting groove, and the right housing E bearing mounting groove, respectively.

[0014] In a preferred embodiment of the present invention, the hollow oil passage is a blind hole coaxially machined on one end face of the intermediate shaft.

[0015] In a preferred embodiment of the present invention, one end of the blind hole is connected to the oil in the gearbox.

[0016] The beneficial effects of the technical solution provided in this application include: the gearbox lubrication system of this invention innovatively combines the advantages of active lubrication and passive lubrication, and through the ingenious design of the intermediate shaft, achieves multiple technical effects, providing strong support for improving the performance and controlling the cost of electric drive gearboxes; specifically, the advantages of this invention are as follows:

[0017] 1. This invention effectively reduces the manufacturing cost of electric drive gearboxes: Through the design of rotating the intermediate shaft to throw oil, the oil can be sprayed to the required position from a greater distance. Therefore, the pressure requirement of the oil pump can be reduced at the same distance, thereby reducing the selection cost of the oil pump and achieving cost savings.

[0018] 2. The present invention has the advantage of simple design: Compared with the active lubrication system, the present invention reduces the design of complex oil passage network, reduces the difficulty of design task, and at the same time reduces the weight of raw materials for shell reinforcement, simplifies the overall design, and helps to improve manufacturing efficiency.

[0019] 3. The present invention simplifies the processing steps: By reducing the number of oil passages in the housing and retaining only the oil passage from the pump to the intermediate shaft, the present invention reduces the design work and processing steps of the oil passages extending to each bearing position and the oil passage inside the differential compared to active lubrication, thereby improving production efficiency.

[0020] 4. The present invention enhances the lubrication effect: The spray design of the intermediate shaft of the present invention not only achieves lubrication and cooling of the bearing position, but also enhances the lubrication effect between the gear rings, thereby improving the working efficiency of the entire system.

[0021] 5. Improved adjustability: By adjusting the spray of the intermediate shaft, the oil can be sprayed more flexibly to the designated position, increasing the adjustable range of the system and making the lubrication and cooling effects more precise.

[0022] 6. This invention reduces dynamic oil storage: This invention reduces the number of oil passages inside the casing, which reduces the amount of oil stored in the oil passages during oil transportation, and correspondingly reduces the dynamic oil storage, which helps to reduce refueling costs. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, and all of them fall within the scope of protection of this application.

[0024] Figure 1 This is a schematic diagram of the structure of a single-speed gearbox assembly using an intermediate shaft gear ring according to the present invention;

[0025] Figure 2 This is a transmission schematic diagram of a single-speed gearbox assembly using an intermediate shaft gear ring for cooling, according to the present invention.

[0026] Figure 3 This is a schematic diagram of the right housing of a single-speed gearbox assembly using an intermediate shaft gear ring according to the present invention.

[0027] Figure 4 This is a schematic diagram of the left housing of a single-speed gearbox assembly using an intermediate shaft gear ring for cooling, according to the present invention.

[0028] Figure 5This is a schematic diagram of the oil spraying from the oil injection hole of the small gear ring of the intermediate shaft to the left housing in a structure of cooling a single-speed gearbox assembly using an intermediate shaft gear ring according to the present invention.

[0029] Figure 6 This is a schematic diagram of the oil spraying from the oil injection hole of the large gear ring of the intermediate shaft to the right housing in a structure of cooling a single-speed gearbox assembly using an intermediate shaft gear ring according to the present invention.

[0030] Figure 7 This is a schematic diagram of the oil injection hole of the small gear ring of the intermediate shaft in the present invention, which utilizes the intermediate shaft gear ring to cool a single-speed gearbox assembly.

[0031] Figure 8 This is a schematic diagram of the oil injection hole of the large gear ring of the intermediate shaft in the present invention, which utilizes the intermediate shaft gear ring to cool a single-speed gearbox assembly. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] like Figure 1-8As shown, this invention discloses a structure for cooling a single-speed gearbox assembly using an intermediate shaft gear ring. The assembly includes a left housing 1 and a right housing 2. An input shaft 3, an intermediate shaft 4, and an output shaft 5 are disposed within the left housing 1 and right housing 2. The input shaft 3 is equipped with a bearing and an input shaft gear ring 7. The intermediate shaft 4 is equipped with a bearing, an intermediate shaft small gear ring 10, and an intermediate shaft large gear ring 11. The output shaft 5 is equipped with a bearing and a differential large gear ring 14. The input shaft gear ring 7 and the intermediate shaft large gear ring 11 mesh and drive each other, as do the intermediate shaft small gear ring 10 and the differential large gear ring 14. The left housing 1 is equipped with a left housing oil collection and guide groove 16 and multiple left... The housing bearing mounting slots are provided, with each left housing bearing mounting slot connected to the left housing oil collecting and guiding groove 16. The right housing 2 is provided with a right housing oil collecting and guiding groove 20 and multiple right housing bearing mounting slots, each connected to the right housing oil collecting and guiding groove 20. The intermediate shaft 4 has a small intermediate shaft gear ring 10 machined on its outer circumferential surface, a large intermediate shaft gear ring 11 fixedly connected to its outer circumferential surface, a hollow oil passage 4.1 coaxially arranged inside the intermediate shaft 4, and intermediate shaft spray holes 4.2 spaced circumferentially and radially extended along its outer circumferential wall. .2 is connected to the hollow oil passage 4.1. The intermediate shaft 4 has intermediate shaft small gear ring 10 with intermediate shaft small gear ring oil injection holes 4.3 arranged circumferentially. The angle between the central axis of each intermediate shaft small gear ring oil injection hole 4.3 and the central axis of the intermediate shaft spray hole 4.2 is an acute angle. Each intermediate shaft small gear ring oil injection hole 4.3 is connected to the hollow oil passage 4.1. The outer peripheral wall of the intermediate shaft 4 is also provided with first intermediate shaft large gear ring oil injection holes 4.5 arranged circumferentially and radially. The intermediate shaft large gear ring 11 is provided with second intermediate shaft large gear ring oil injection holes 4.4 arranged circumferentially. The two intermediate shaft large gear ring oil injection holes 4.4 are arranged in a one-to-one correspondence with the first intermediate shaft large gear ring oil injection holes 4.5. Each second intermediate shaft large gear ring oil injection hole 4.4 includes a straight oil injection hole 4.4.1 arranged coaxially with the first intermediate shaft large gear ring oil injection hole 4.5 and an oblique oil injection hole 4.4.2 arranged at an obtuse angle with the straight oil injection hole 4.4.1. The central axis of the oblique oil injection hole 4.4.2 is arranged out of plane with the intermediate shaft small gear ring oil injection hole 4.3. The central axis of the intermediate shaft small gear ring oil injection hole 4.3 intersects with the left housing oil collection and guide groove 16, and the central axis of the oblique oil injection hole 4.4.2 intersects with the right housing oil collection and guide groove 20.

[0034] Preferably, the input shaft 3 is provided with bearing A 6, input shaft gear ring 7 and bearing B 8, with the input shaft gear ring 7 located between bearing A 6 and bearing B 8.

[0035] Preferably, the intermediate shaft 4 is provided with a C bearing 9, an intermediate shaft small gear ring 10, an intermediate shaft large gear ring 11 and a D bearing 12, with the intermediate shaft small gear ring 10 and the intermediate shaft large gear ring 11 located between the C bearing 9 and the D bearing 12.

[0036] Preferably, the output shaft 5 is provided with an E bearing 13, a differential large gear ring 14 and an F bearing 15, with the differential large gear ring 14 located between the E bearing 13 and the F bearing 15.

[0037] Preferably, the left housing 1 is provided with a left housing oil collecting and guiding groove 16, a left housing B bearing mounting groove 17, a left housing D bearing mounting groove 18, and a left housing F bearing mounting groove 19, and the left housing B bearing mounting groove 17, the left housing D bearing mounting groove 18, and the left housing F bearing mounting groove 19 are respectively connected to the left housing oil collecting and guiding groove 16.

[0038] Preferably, the right housing 2 is provided with a right housing oil collecting and guiding groove 20, a right housing A bearing mounting groove 21, a right housing C bearing mounting groove 22 and a right housing E bearing mounting groove 23, and the right housing A bearing mounting groove 21, the right housing C bearing mounting groove 22 and the right housing E bearing mounting groove 23 are respectively connected to the right housing oil collecting and guiding groove 20.

[0039] Preferably, the inner sidewall of the left housing 1 is provided with oil guide ribs and intermediate oil guide holes for guiding the lubricating oil in the left housing oil collection and guide groove 16 to the left housing oil collection and guide groove 16, the left housing B bearing mounting groove 17, and the left housing D bearing mounting groove 18, respectively.

[0040] Preferably, the inner wall of the right housing 2 is provided with oil guide ribs and intermediate oil guide holes for guiding the lubricating oil in the right housing oil collection and guide groove 20 to the right housing A bearing mounting groove 21, the right housing C bearing mounting groove 22, and the right housing E bearing mounting groove 23, respectively.

[0041] Preferably, the hollow oil passage 4.1 is a blind hole coaxially machined on one end face of the intermediate shaft 4.

[0042] Preferably, one end of the blind hole is connected to the oil in the gearbox.

[0043] This invention introduces an intermediate shaft oil spray design, specifically a design that uses the rotating intermediate shaft to spray oil onto designated locations, achieving active lubrication and cooling of the bearings and gear rings. Furthermore, this invention enables precise oil spraying angles: the spray holes on the small and large gear rings of the intermediate shaft are staggered, ensuring that the oil is sprayed into the oil collection and guiding grooves while avoiding collisions that could prevent oil from reaching the appropriate grooves, thus guaranteeing the normal operation of the system. This invention also reduces dynamic oil accumulation: by reducing the number of oil passages within the housing, the amount of dynamically accumulated oil is reduced, effectively lowering refueling costs.

[0044] In summary, this invention primarily utilizes an oil pump to deliver oil from the oil pan to the central hollow shaft. The pressure applied by the oil pump, combined with the ejection force from the rotating central hollow shaft, propels the oil through oil holes on the shaft. Utilizing fewer specific oil-guiding features on the housing, lubrication and cooling are achieved. This invention offers the following technical advantages: 1. By leveraging the oil-throwing effect of the rotating central shaft, the distance the oil travels through the small holes on the shaft is increased. This allows for a reduction in the pressure applied by the oil pump over the same distance, further reducing the required pump power and saving costs. 2. The spraying action of the central shaft necessitates fewer features on the housing design, reducing design complexity and the weight of reinforcing materials compared to passive lubrication, thus saving costs. 3. By reducing the number of oil passages within the housing, retaining only the passage from the pump to the central shaft, the design work and machining processes for oil passages extending to various bearing positions and the differential are reduced compared to active lubrication. Furthermore, the reduced number of oil passages also decreases the dynamic oil retention, saving on lubrication costs. 4. Enhanced lubrication between gear rings.

[0045] It is understandable that:

[0046] During the operation of new energy vehicles, the gearbox needs to be lubricated and cooled between the gear rings, lubricated and cooled at each bearing position, and lubricated and cooled inside the differential.

[0047] The size of the nozzle is determined based on the lubrication and cooling oil requirements of the gearbox assembly; the bending angle of the nozzle is determined based on the distance and height of the spray nozzles from the left and right housings of the gearbox; the number of spray nozzles is determined based on the required oil volume. Typically, the intermediate shaft and the small gear ring are manufactured as a single unit. After the large gear ring is manufactured, it is assembled and fixed to the intermediate shaft at the mating position. In this case, the oil spray nozzles on the large gear ring of the intermediate shaft must correspond one-to-one with the oil spray nozzles on the shaft to avoid misalignment and blockage; alternatively, the large gear ring can also be manufactured as a single unit with the intermediate shaft.

[0048] The oil in the gearbox is pressurized by the oil pump and then transported to the intermediate shaft through channels. The intermediate shaft is a blind shaft, machined to have one end open and the other closed. The oil is sprayed through oil holes on the shaft to designated positions in the gearbox, and then flows into the bearing positions A, B, C, D, E, and F through the oil collection and guide groove structure.

[0049] Specifically:

[0050] Oil is sprayed from the small gear ring of the intermediate shaft into the left housing, where it converges in the oil collection and guide groove, and flows through the oil guide ribs on both sides and the middle oil guide hole into the bearing positions B, D, and F of the left housing, respectively, to lubricate and cool the bearings installed in these positions.

[0051] Oil is sprayed from the oil injection hole of the large gear ring of the intermediate shaft onto the right housing, where it converges in the oil collection and guide groove, and flows through the oil guide ribs on both sides and the middle oil guide hole into the right housing bearing positions A, C, and E, respectively, to lubricate and cool the bearings installed in those positions.

[0052] The oil injection holes of the small gear ring and the large gear ring of the intermediate shaft are staggered at different angles to avoid the oil failing to reach the corresponding oil collection and guide groove due to the two colliding during spraying.

[0053] The intermediate shaft spray hole mainly sprays oil into the differential through the internal opening of the differential to lubricate and cool the differential.

[0054] The above completes the active lubrication and cooling of the gearbox bearings and differential.

[0055] In addition, during the high-speed rotation of the intermediate shaft, the interface containing the spray holes will inevitably form a ring-shaped oil surface. Except for a fixed angle where the oil will be sprayed onto the oil collection and guide groove, other angles will spray onto the gear ring that is in contact with it, forming active lubrication of the gear ring. The oil spray hole of the small gear ring of the intermediate shaft will spray and cool and lubricate the large gear ring of the differential; the oil spray hole of the large gear ring of the intermediate shaft will spray and cool and lubricate the input shaft gear ring.

[0056] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0057] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0058] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A structure for cooling a single-speed gearbox assembly using an intermediate shaft gear ring, comprising a left housing (1) and a right housing (2), wherein an input shaft (3), an intermediate shaft (4), and an output shaft (5) are disposed within the left housing (1) and the right housing (2), wherein a bearing and an input shaft gear ring (7) are disposed on the input shaft (3), a bearing, an intermediate shaft small gear ring (10), and an intermediate shaft large gear ring (11) are disposed on the intermediate shaft (4), and a bearing and a differential large gear ring (14) are disposed on the output shaft (5), wherein the input shaft gear ring (7) The intermediate shaft large gear ring (11) and the intermediate shaft small gear ring (10) mesh with the differential large gear ring (14). The left housing (1) is provided with a left housing oil collecting and guiding groove (16) and a plurality of left housing bearing mounting grooves, each left housing bearing mounting groove communicating with the left housing oil collecting and guiding groove (16). The right housing (2) is provided with a right housing oil collecting and guiding groove (20) and a plurality of right housing bearing mounting grooves, each right housing bearing mounting groove communicating with the right housing oil collecting and guiding groove (20). The characteristic is that: The intermediate shaft (4) has a small gear ring (10) machined on its outer circumferential surface, and a large gear ring (11) fixedly connected to its outer circumferential surface. A hollow oil passage (4.1) is coaxially arranged inside the intermediate shaft (4). Intermediate shaft spray holes (4.2) are arranged circumferentially and radially on the outer circumferential wall of the intermediate shaft (4). The intermediate shaft spray holes (4.2) and the hollow oil passage (4.1) are... The intermediate shaft (4) is connected to the hollow oil passage (4.1). The intermediate shaft (4) has oil injection holes (4.3) spaced circumferentially on its intermediate shaft small gear ring (10). The central axis of each intermediate shaft small gear ring oil injection hole (4.3) forms an acute angle with the central axis of the intermediate shaft spray hole (4.2). The intermediate shaft small gear ring oil injection hole (4.3) is connected to the hollow oil passage (4.1). The outer peripheral wall of the intermediate shaft (4) is also provided with oil injection holes spaced circumferentially and arranged along its outer periphery. The intermediate shaft large gear ring (11) has a first intermediate shaft large gear ring oil injection hole (4.5) arranged radially. The intermediate shaft large gear ring (11) is provided with second intermediate shaft large gear ring oil injection holes (4.4) arranged circumferentially. The second intermediate shaft large gear ring oil injection holes (4.4) are arranged in a one-to-one correspondence with the first intermediate shaft large gear ring oil injection holes (4.5). Each second intermediate shaft large gear ring oil injection hole (4.4) includes a portion arranged coaxially with the first intermediate shaft large gear ring oil injection hole (4.5). The direct injection port (4.4.1) and the oblique injection port (4.4.2) arranged at an obtuse angle to the direct injection port (4.4.1) are arranged opposite to the injection port (4.4.2) of the intermediate shaft small gear ring. The central axis of the injection port (4.4.2) of the intermediate shaft small gear ring intersects with the oil collection and guide groove (16) of the left housing, and the central axis of the injection port (4.4.2) intersects with the oil collection and guide groove (20) of the right housing.

2. The structure of the single-speed gearbox assembly using an intermediate shaft gear ring for cooling according to claim 1, characterized in that: The input shaft (3) is provided with bearing A (6), input shaft gear ring (7) and bearing B (8), with the input shaft gear ring (7) located between bearing A (6) and bearing B (8).

3. The structure of the single-speed gearbox assembly using an intermediate shaft gear ring for cooling according to claim 1, characterized in that: The intermediate shaft (4) is provided with a C bearing (9), a small gear ring (10), a large gear ring (11) and a D bearing (12), with the small gear ring (10) and the large gear ring (11) located between the C bearing (9) and the D bearing (12).

4. The structure of the single-speed gearbox assembly using an intermediate shaft gear ring for cooling according to claim 1, characterized in that: The output shaft (5) is provided with an E bearing (13), a differential ring gear (14) and an F bearing (15), with the differential ring gear (14) located between the E bearing (13) and the F bearing (15).

5. The structure of the single-speed gearbox assembly using an intermediate shaft gear ring for cooling according to claim 1, characterized in that: The left housing (1) is provided with a left housing oil collecting and guiding groove (16), a left housing B bearing mounting groove (17), a left housing D bearing mounting groove (18) and a left housing F bearing mounting groove (19), and the left housing B bearing mounting groove (17), the left housing D bearing mounting groove (18) and the left housing F bearing mounting groove (19) are respectively connected to the left housing oil collecting and guiding groove (16).

6. The structure of the single-speed gearbox assembly using an intermediate shaft gear ring for cooling according to claim 1, characterized in that: The right housing (2) is provided with a right housing oil collecting and guiding groove (20), a right housing A bearing mounting groove (21), a right housing C bearing mounting groove (22) and a right housing E bearing mounting groove (23), and the right housing A bearing mounting groove (21), the right housing C bearing mounting groove (22) and the right housing E bearing mounting groove (23) are respectively connected to the right housing oil collecting and guiding groove (20).

7. The structure of the single-speed gearbox assembly using an intermediate shaft gear ring for cooling according to claim 5, characterized in that: The inner wall of the left housing (1) is provided with oil guide ribs and intermediate oil guide holes for guiding the lubricating oil in the oil collection and guide groove (16) of the left housing to the bearing mounting groove (17) of the left housing B, the bearing mounting groove (18) of the left housing D, and the bearing mounting groove (19) of the left housing respectively.

8. The structure of the single-speed gearbox assembly using an intermediate shaft gear ring as described in claim 6, characterized in that: The inner wall of the right housing (2) is provided with oil guide ribs and intermediate oil guide holes for guiding the lubricating oil in the right housing oil collection and guide groove (20) to the right housing A bearing mounting groove (21), the right housing C bearing mounting groove (22), and the right housing E bearing mounting groove (23).

9. The structure of the single-speed gearbox assembly using an intermediate shaft gear ring for cooling according to claim 1, characterized in that: The hollow oil passage (4.1) is a blind hole coaxially machined on one end face of the intermediate shaft (4), and one end of the blind hole is connected to the oil in the gearbox.

10. The structure of the single-speed gearbox assembly using an intermediate shaft gear ring for cooling according to claim 1, characterized in that: The intermediate shaft spray hole (4.2) corresponds to the position of the internal opening of the differential. The intermediate shaft spray hole (4.2) sprays oil into the differential through the internal opening of the differential to lubricate and cool the differential.

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